Which Iranian officials have been killed, who's in charge now - and who will be its new leader?

The death of Ayatollah Ali Khamenei in US-Israel strikes on Saturday marks a major transition for Iran - having been in power for almost 37 years, he was only the second leader of Iran's Islamic Republic.

He took over from the regime's founding figurehead, Ayatollah Ruhollah Khomeini, when he died in June 1989 - just over 10 years after the establishment of the republic in 1979.

Iran's supreme leader has the final say in all matters of state.

Which senior leaders have died?

In addition to Khamenei, several other senior officials were killed in US-Israeli airstrikes too.

They include Iran's army chief of staff, General Abdol Rahim Mousavi, and defence minister General Aziz Nasirzadeh.

Also killed was Major General Mohammad Pakpour, who took over as the Revolutionary Guard's top commander after Israel killed its last commander last June, and Ali Shamkhani, a top security adviser to Khamenei.

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Iranian media said Khamenei's daughter, grandchild, son-in-law and daughter-in-law were killed as well.

The Israel Defence Forces (IDF) also claimed it had killed:

• Saleh Asadi, head of the Intelligence Directorate of the Khatam al Anbiya emergency command;
• Mohammad Shirazi, head of the military bureau;
• Hossein Jabal Amelian, head of SPND (Organisation of Defensive Innovation and Research);
• And Reza Mozaffari-Nia, a former head of SPND and former deputy defence minister.

What happens now?

A three-person temporary leadership council has been formed to govern the country and temporarily assume the duties of supreme leader, in line with Islamic Republic law.

It includes Iran's reformist president, Masoud Pezeshkian, and the hard-line head of the judiciary, Gholamhossein Mohseni Ejei.

There will also be a jurist, Alireza Arafi, who is a member of Iran's Guardian Council and head of the Basij, a volunteer paramilitary force.

"We had prepared for such moments and have plans in place for all scenarios, even for the time after the martyrdom of revered Imam Khamenei," said Mohammad Bagher Qalibaf, Iran's parliamentary speaker.

He added: "You'll see that after the leadership council is formed, the power and integrity of officials, defensive forces and the people will be beyond imagination."

The country's foreign minister, Abbas Araghchi, said a new supreme leader would be chosen in "one or two days".

Who chooses the new leader?

While the leadership council will govern in the interim, an 88-member panel called the Assembly of Experts will pick a new leader. Under Iranian law, that must happen as soon as possible.

The panel is made up of Shia clerics elected every eight years and whose candidacies are approved by Iran's constitutional watchdog.

The Guardian Council is known for disqualifying candidates. It barred former Iranian president Hassan Rouhani from election to the Assembly of Experts in March 2024.

A relative moderate, he struck the JCPOA nuclear deal with world powers in 2015, from which the US, under Donald Trump, later withdrew.

Who could be the new supreme leader?

Under Iran's system of vilayat-e faqih - guardianship of the Islamic jurist - the supreme leader must be a senior leader with political and religious authority.

Khamenei's power was often wielded through close advisers. But it is unclear how many have survived, and he was never publicly recorded as naming a successor.

His son, Mojtaba ​Khamenei, a 56-year-old cleric, has been seen as a possible successor. He has never held government office, however.

That said, he has been described as a gatekeeper to his father.

He studied under religious conservatives in seminaries in the city of Qom, and is described as a hardliner with close ties to the Revolutionary Guard.

It had been thought that former president Ebrahim Raisi might seek the leadership, but he died in a helicopter crash in May 2024.

Regime change?

Mr Trump is urging Iranians to take the opportunity to overthrow the Islamic Republic, which has been accused of murdering tens of thousands of its own citizens in recent weeks.

The US president has described the death of Khamenei as the "single greatest chance for the Iranian people to take back their country".

And he has claimed that many people in the Revolutionary Guard, military and other security and police forces "no longer want to fight".

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How have Iranians reacted to death of supreme leader?

Before the Iranian revolution, Iran was ruled by a monarchy, with the king called the "shah".

Reza Pahlavi, the US-based son of the shah who was deposed in the 1979 revolution has said: "With [Khamenei's] death, the Islamic Republic has in effect reached its end and will very soon be consigned to the dustbin of history."

Any attempts to appoint a successor to Khamenei are "doomed to fail from the outset", Mr Pahlavi added, claiming they will have neither longevity nor legitimacy.

He has urged Iran's military, law enforcement and security forces to take their "final opportunity to join the nation".

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